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A recent Brief Report [Phys. Rev. A 79, 035801 (2009)] investigates twofigures of merit for heralded photon sources based on spontaneous parametricdown-conversion with a continuous pump, namely the time-averaged temporalcoherence between the signal and idler beams and the time-averaged conditionedsecond-order degree of coherence for photons in the heralded arm. However,contrary to what is claimed, no one-arm second-order effect is actuallymeasured.

Comment on "Coherence measures for heralded single-photon sources"